I voted no way but not because I am opposed to a trip to the planetarium under certain circuмstances. We just wouldn't send ours to SSPX schools the way they are headed. Very sad to say.

That seems like a more reasonable stance. Trusting the school enough to let them teach your kids every day, yet NOT trusting them enough to let your child spend one day at a secular planetarium, seems majorly inconsistent.

What do you think of this?

It is taken from Stephen Fox's "Is This Operation ѕυιcιdє?" (p. 10):

"By way of example, I recall that some years ago, I and my wife faced the dilemma of how we should educate our high school aged children. By way of background, we are grateful to have access to a Society primary school but when our oldest child was 13 years old we needed to decide whether to educate him by (a) home school (b) state secular school (c) secular private school or (d) "Catholic" private school. I consulted at least five priests of the Society in relation to the issue and I received a number of opinions. The common opinion (from all the priests I consulted) was that I should not send my son to the "Catholic school" because if I did so he would lose his faith. The reason was that the "Catholic school" would mix some truth with error and that he would lose his faith in circuмstances where he would be subjected to the modern system under the name of "Catholicism". The advice was to the effect that if we chose to send him to a high school then we should send him to a school that was irreligious or that was clearly non-Catholic.

My common sense says that that same reasoning should apply to the issue of whether or not the Society should mix with the Conciliar Church when the Conciliar Church is mired in modernism and liberalism. How can the Society (by its priests) on one hand advise me to keep my children out of the Conciliar Catholic schools but on the other hand propose to put itself (and my family) into the Conciliar Church."
https://isthisoperationѕυιcιdє.files.wordpress.com/2012/10/operation-ѕυιcιdє-published-20121029.pdf

The point being, what about sending them to a classical secular charter school with a classical Trivium curriculum?

It would be worth starting a whole new pole to see if Trads find this alternative given the OP's circuмstances an acceptable option:

The children will be exposed to drugs, sex-ed, religious indifference, etc., but no subtle attacks on the faith?

Isn't that "6 of one, and 1/2 dozen of the other?"

If Mr. Fox is to be believed, classic SSPX priests said otherwise!

I know some SSPX families who have tried the "classical charter school" route.  I don't know any who persevered in that experiment.

Hello-
I am the OP, and wanted to address a couple of your points:
Ideally, we would not send our kids to the SSPX school, because as you say, we no longer trust them.
However, after having tried to homeschool on a couple occasions, we are simply unable to do it: We have an autistic child, and my wife has health issues.  We also have a large family, and we are making doctor and/or dentist visits at least 2x/week.  We simply don't have the nice ordered life that allows us to routinize homeschooling.  Again, we have tried more than once and failed.

So, somehow, some way, we need to send them to.....some school.

That said, the SSPX school is in our circuмstances, the least of all evils (despite the real evils).

Our only choice is to be vigilant, and mitigate the damage as much as possible.

Before making this decision, I asked 7 priests and bishops (1 SSPX, and the rest Resistance) for their advice: By a majority of 5-2, they all said to send the kids to the SSPX school, but remain vigilant.

So, insofar as the SSPX school is unavoidable, all I can do is interject when I become aware of these risky activities.

What other choice do I have?  Let them stay in the school, and not even try to limit the poison?

I sympathize with your situation. I realize that my ability to say no way and then homeschool is a luxury of circuмstances that not everyone is afforded. In spite of the possible dangers, so much depends on the priests in charge and maybe you have a good one. A good, stable SSPX school is still far better than any other alternative. Maybe you have a good rapport with the principal and teachers and can ask to accompany them? Maybe you can ask ahead of time how they plan to treat some of the errors that will be presented? Not all the SSPX priests in the trenches agree with what's going on up top, so maybe you can have confidence in your school. You just have to ask the questions. If not, keep them home and promise to go as a family some day when you can be there to teach them. (If that's possible) 

I sympathize with your situation. I realize that my ability to say no way and then homeschool is a luxury of circuмstances that not everyone is afforded. In spite of the possible dangers, so much depends on the priests in charge and maybe you have a good one. A good, stable SSPX school is still far better than any other alternative. Maybe you have a good rapport with the principal and teachers and can ask to accompany them? Maybe you can ask ahead of time how they plan to treat some of the errors that will be presented? Not all the SSPX priests in the trenches agree with what's going on up top, so maybe you can have confidence in your school. You just have to ask the questions. If not, keep them home and promise to go as a family some day when you can be there to teach them. (If that's possible)

OP here: Though I have requested permission to keep them at home that day, it was a formality (i.e., the SSPX likes to believe they are in charge when they are not).  Regardless of the response, they will stay at home, and if there should be consequences as a result, it will evince God's providence (which will give peace).

Hello-
I am the OP, and wanted to address a couple of your points:
Ideally, we would not send our kids to the SSPX school, because as you say, we no longer trust them.
However, after having tried to homeschool on a couple occasions, we are simply unable to do it: We have an autistic child, and my wife has health issues.  We also have a large family, and we are making doctor and/or dentist visits at least 2x/week.  We simply don't have the nice ordered life that allows us to routinize homeschooling.  Again, we have tried more than once and failed.

So, somehow, some way, we need to send them to.....some school.

That said, the SSPX school is in our circuмstances, the least of all evils (despite the real evils).

Our only choice is to be vigilant, and mitigate the damage as much as possible.

Before making this decision, I asked 7 priests and bishops (1 SSPX, and the rest Resistance) for their advice: By a majority of 5-2, they all said to send the kids to the SSPX school, but remain vigilant.

So, insofar as the SSPX school is unavoidable, all I can do is interject when I become aware of these risky activities.

What other choice do I have?  Let them stay in the school, and not even try to limit the poison?

OK all of that makes sense.  I have Aspergers myself, so I have some experience from having been on the kid side of the autism issue, but I don't know how much your mileage would vary, or not.

If your kids are already Resistance kids, I guess I'd question why you're seriously concerned about them going to the Planetarium for one day.  Like I'm not sure how exactly going to the Planetarium for one day will substantially damage their souls in a way that wouldn't be otherwise.  If your children, as you say, are able to understand your reasoning here well enough to be in agreement with it, why couldn't they apply the same discernment to whatever the planetarium workers wound up sharing with them?

Maybe I'm wrong, and as someone who doesn't have kids, I certainly wouldn't presume to tell anyone else how to raise there's, especially on a matter that doesn't really have to do with right or wrong (I don't think its wrong to play it safe, especially if your children are on board and thus there's no real danger of exasperating them), I guess I just don't quite understand here.

^^^ homeschoolmom

No way, Jose!